DatabaseConnection.java 文件源码

/**
 * @return true if the test query was successful and false if not
 */
@CheckReturnValue
public boolean runTestQuery() {
    final EntityManager em = this.emf.createEntityManager();
    try {
        em.getTransaction().begin();
        em.createNativeQuery(TEST_QUERY).getResultList();
        em.getTransaction().commit();
        return true;
    } catch (final PersistenceException e) {
        log.error("Test query failed", e);
        return false;
    } finally {
        em.close();
    }
}